Topsoil Selection for Floratam St. Augustine on Clay

A Brownsville, TX homeowner with clay soil added river-sourced topsoil years ago; grass declined. New river soil was ready to spread; asked if it's suitable.

Best Practice

Don't layer different soils. Spread new soil, then till 6 inches deep to blend with existing clay. This requires removing sod or starting from seed/sprigs/sod.

Alternative If Keeping Sod

• Spread a thin layer (¼–½ inch) of soil/compost.
• Core aerate to incorporate.

First, Check pH & Fertility

Clay isn't inherently bad. Test pH (target 6.5) and fertilize appropriately before adding soil.

Blending creates a uniform root zone; layering creates water movement problems.